The 5th Adventure Waterdeep: Dragon Heist is an urban-style adventure set in a very large city. While the adventure itself is good and has plenty of resources in the city, there is a lack of details that will help the DM bring the city to life. Similar to Water Défep: Dungeon of the Mad Mage, while dungeon crawling takes place, the player expects players to spend some time in the city between dives in Undermountain.
For example, there are no details about the placement of many of the buildings he refers to in the adventure and leaves it to the DM to place them. This places a heavy burden on the DM to make room for things like taverns, shops and the like on most of the streets in Waterdeep (of which there are many!).
There are also no details on how or where the sewers run in the city, while playing an important role in various stages of the adventure.
Are there resources from other issues that can help to fill these gaps?